Originally Posted by
Swapnil Deshpande
The Flehmen's response- A phenomenon exhibited by cats in which they draw back their lips in a manner that makes them appear to be "grimacing" or "smirking".The action, which is adopted when examining scents left by other animals either of the same species or of prey.. Flehming allows the animals to determine several factors, including the presence or absence of estrus, the physiological state of the animal, and how long ago the animal passed by.Response also observed in stallions,goats n young elephants.
Source -wikipedia
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